Kit Man Cham from 11206 Mount Crest Dr, Cupertino, CA 95014, age 73, Phone: 4089730704

Us Patents

Optical Chip Coupling System Utilizing Micromachine Adjustable Optical Elements And A Feedback Circuit Providing The Micromachine With A Feedback Signal Correlated To An Optical Signal Parameter
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US Patent:

7049570, May 23, 2006
Filed:

Sep 16, 2002
Appl. No.:

10/245632
Inventors:

Kit M. Cham - Cupertino CA, US
Frank H. Peters - San Jose CA, US
Assignee:

Avago Technologies, Ltd. - Singapore
International Classification:

G01J 1/20
US Classification:

2502011, 385 18
Abstract:

An optical communication system including an integrated circuit chip, an electro-optical chip operatively integrated on the integrated circuit chip, an adjustable optical chip which includes at least one optical element disposed between the electro-optical chip and one of a source or recipient of at least one optical signal, at least one micromachine operatively coupled to the at least one optical element to selectively manipulate the at least one optical element; an optical signal sensor disposed relative to the at least one optical signal to sense an optical signal condition data, and to transmit said optical signal condition data to the integrated circuit chip, a feedback circuit between the integrated circuit chip and the at least one micromachine, the integrated circuit chip configured to receive the optical signal condition data, convert it to a corresponding feedback signal, and to transmit the feedback signal through the feedback circuit to the micromachine, thereby causing the micromachine to selectively manipulate the at least one optical element to alter the optical signal.

Highly Parallel Optical Communication System With Intracard And Intercard Communications
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US Patent:

7653272, Jan 26, 2010
Filed:

Sep 19, 2002
Appl. No.:

10/252145
Inventors:

Kit M. Cham - Cupertino CA, US
Lisa A. Buckman - Pacifica CA, US
Assignee:

Avago Technologies Fiber IP (Singapore) Pte. Ltd. - Singapore
International Classification:

G02B 6/12
US Classification:

385 17, 385 14
Abstract:

An optical communications system including a method and apparatus with an electro-optical chip which includes optical interface elements in optical interface array configuration on a first side of the electro-optical chip, attached to or integrated with an optical circuit board which includes a plurality of layered optical wave guides, a plurality of coupling elements disposed relative to the electro-optical chip such that the plurality of coupling elements optically communicate with the first plurality of optical interface elements on the electro-optical chip, and wherein the coupling elements are further disposed to optically communicate with the plurality of optical wave guides.

Consumer Input/Output (Cio) Optical Transceiver Module For Use In An Active Optical Cable, An Active Optical Cable That Incorporates The Cio Optical Transceiver Module, And A Method
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US Patent:

8195017, Jun 5, 2012
Filed:

May 31, 2010
Appl. No.:

12/790904
Inventors:

Ronald T. Kaneshiro - San Jose CA, US
Xiaozhong Wang - Sunnyvale CA, US
Kit Man Cham - Cupertino CA, US
Paul Yu - Mountain View CA, US
Chung-Yi Su - Fremont CA, US
Assignee:

Avago Technologies Fiber IP (Singapore) Pte. Ltd. - Singapore
International Classification:

G02B 6/30
G02B 6/36
G02B 6/12
US Classification:

385 49, 385 14, 385 88, 385147
Abstract:

A consumer input/output (CIO) optical transceiver module, an active optical cable that incorporates a CIO optical transceiver module, and a method for using a CIO optical transceiver module in an active optical cable are provided. In contrast to optical transceiver modules currently used in active optical cables, which utilize parallel arrays of laser diodes and parallel arrays of photodiodes, the CIO optical transceiver module includes two singlet laser diodes and two singlet photodiodes for providing two high-speed transmit channels and two high-speed receive channels, respectively. Because the singlet laser diodes and photodiodes of the CIO optical transceiver module are less costly than the parallel arrays of laser diodes and parallel arrays of photodiodes that are used in known active optical cables, the CIO optical transceiver module can be manufactured at relatively low costs with high quality, and therefore is well suited for consumer applications.

Active Optical Cable Apparatus And Method For Detecting Optical Fiber Breakage
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US Patent:

20110013905, Jan 20, 2011
Filed:

Jul 17, 2009
Appl. No.:

12/504846
Inventors:

Xiaozhong Wang - Sunnyvale CA, US
Kit Man Cham - Cupertino CA, US
Assignee:

AVAGO TECHNOLOGIES FIBER IP (SINGAPORE) PTE. LTD. - Singapore
International Classification:

H04B 10/08
US Classification:

398 21
Abstract:

Embodiments of the invention include an active optical cable and method for controlling the operation of the active optical cable based on the detection of signal loss, e.g., due to fiber breakage, within the active optical cable. The active optical cable includes first and second optical transceivers, each with an open fiber control module coupled between the transmission side and the receiver side of the respective optical transceiver. The transmission side of each optical transceiver is coupled to the receiver side of the other optical transceiver via a plurality of transmission channels, such as a plurality of optical fibers. Each open fiber control module is configured to detect an optical power level of an optical signal received by the receiver side of the optical transceiver within which the open fiber control module resides and, based on such detection, control the operation of the corresponding transmission side of the optical transceiver.

Active Optical Cable That Is Suited For Consumer Applications And A Method
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US Patent:

20110268390, Nov 3, 2011
Filed:

May 1, 2010
Appl. No.:

12/772207
Inventors:

Robert Yi - San Jose CA, US
Xiaozhong Wang - Sunnyvale CA, US
Kit Man Cham - Cupertino CA, US
Paul Yu - Mountain View CA, US
Assignee:

AVAGO TECHNOLOGIES FIBER IP (SINGAPORE) PTE. LTD. - Singapore
International Classification:

G02B 6/26
G02B 6/36
G02B 6/00
US Classification:

385 50, 385 77, 385135
Abstract:

An active optical cable is provided that is well suited for consumer applications. In contrast to known Quad Small Form-Factor Pluggable (QSFP) active optical cables, the active optical cable incorporates at least one consumer input/output (CIO) optical transceiver module that is well suited for consumer applications. The plug housing of the known QSFP active optical cable has been modified to house at least one CIO optical transceiver module that utilizes laser diode and photodiode singlets, rather than the parallel laser diode and photodiode arrays used in the known QSFP active optical cables. These features reduce the overall cost of the active optical cable and make it well suited for consumer applications.

Bicmos Logic Gate With Higher Pull-Up Voltage
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US Patent:

49995235, Mar 12, 1991
Filed:

Dec 5, 1989
Appl. No.:

7/446370
Inventors:

Kit M. Cham - Cupertino CA
Robert E. Gleason - San Carlos CA
Assignee:

Hewlett-Packard Company - Palo Alto CA
International Classification:

H03K 1704
US Classification:

307570
Abstract:

A novel BICMOS output buffer is taught including circuit means for firstly discharging the bases of the bipolar pull up and bipolar pull down transistors, and secondly to connect the base of an output transistor to its emitter when that output transistor is conducting, thereby insuring maximum voltage swing of the output voltage. The circuit means comprises an MOS transistor for discharging the base of an output transistor, and a depletion mode MOS transistor for connecting the base of an output transistor to its emitter. By utilizing MOS and depletion mode transistors, a significant area advantage is achieved, particularly when the MOS and depletion mode transistors are merged.

Salient Integration Mode Active Pixel Sensor
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US Patent:

59526866, Sep 14, 1999
Filed:

Dec 3, 1997
Appl. No.:

8/984457
Inventors:

Eric Y. Chou - Fremont CA
Kit M. Cham - Cupertino CA
Jane M. J. Lin - San Jose CA
Assignee:

Hewlett-Packard Company - Palo Alto CA
International Classification:

H01L 2714
H01L 3100
US Classification:

257292
Abstract:

A salient integration mode active pixel sensor. The active pixel sensor includes an amplify/compare transistor which has a threshold voltage. The amplify/compare transistor couples an input of the amplify/compare transistor to an output of the amplify/compare transistor when the input of the amplify/compare transistor exceeds the threshold voltage. A photo-diode generates a signal voltage which has a voltage level dependent upon the intensity of light received by the photo-diode. The signal voltage is coupled to the input of the amplify/compare transistor. A reset element couples a reset line to the photo-diode and discharges the photo-diode when the reset line is active. A coupling capacitor for couples a select line to the input of the amplify/compare transistor. The select line causes the input to the amplify/compare transistor to exceed the threshold voltage and thereby couple the signal voltage to the output of the amplify/compare transistor. The amplify/compare transistor can be an N-type MOSFET and the reset transistor can be an N-type MOSFET.

Mosfet Structure And Method For Making Same
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US Patent:

48946940, Jan 16, 1990
Filed:

Jan 20, 1988
Appl. No.:

7/146068
Inventors:

Kit M. Cham - Sunnyvale CA
Paul V. Voorde - Mountain View CA
Assignee:

Hewlett-Packard Company - Palo Alto CA
International Classification:

H01L 2978
US Classification:

357 233
Abstract:

A MOSFET structure characterized by a lightly doped tip region located between the channel and drain, and a buried region located below the tip region and shifted laterally towards the drain. The buried region, which is doped to a level intermediate between that of the tip region and the drain, causes the channel current to deflect downwardly from the field oxide, through the lightly doped tip region, and into the buried region. The gradual electric field gradient produced by the structure and the deflection of the channel current away from the thin oxide greatly reduces the device's sensitivity to the hot electron effect. The method of the invention includes forming the lightly doped tip region, forming a first oxide spacer, forming the buried region, widening the oxide spacer, and finally forming the drain region.